In the basin soil, we can add some substances, such as ash powder and other things containing potassium fertilizer, so that the root growth process can be accelerated. The formation of thick roots is expected. Generally speaking, there are four to five years of the size of the Spring Festival, its main root length will be thumb thick, at this time we can carry out the basin operation. The time is one day before late autumn, or one day before Qingming. At this time, we need to dig out the whole tree, shake the loose soil attached to the root, carefully study the growth direction of the root, determine the future root system, and cut off all the lateral roots and fibrous roots except the ones we need. The shape of the branches must be carefully cut, so that the future shape will still maintain the standard. Two thirds of the main roots are buried in the soil and the rest in the air. The next year, we will wash the basin with water to expose the main body of the buried soil. Washing should be carried out many times, once a time, do not cut off the root in time, until the desired effect is achieved, let the main root become a bonsai
We can use cutting method to cultivate thick roots. The operation can be carried out in spring, summer and autumn. If the branches we need are semi lignified, they can be planted in sand and soil to keep water content, and they can be rooted in about 15 days. If the long branches are buried in the sand, no carving is needed, about 40-50 days can take root, and then the next spring can be separated from the mother plant to cultivate a very thick root plant.
